I am processing method statements in a class and i want to find type of an identifier in those statements.
import 'package:analyzer/dart/analysis/results.dart';
import 'package:analyzer/dart/analysis/session.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/ast/visitor.dart';
import 'package:analyzer/dart/element/element.dart';
import 'package:build/build.dart';
import 'package:dstore/dstore.dart';
import 'package:dstore_generator/src/utils.dart';
import 'package:source_gen/source_gen.dart';
AstNode getAstNodeFromElement(Element element) {
AnalysisSession session = element.session;
ParsedLibraryResult parsedLibResult =
session.getParsedLibraryByElement(element.library);
ElementDeclarationResult elDeclarationResult =
parsedLibResult.getElementDeclaration(element);
return elDeclarationResult.node;
}
class SelectorsGenerator extends GeneratorForAnnotation<Selectors> {
#override
String generateForAnnotatedElement(
Element element, ConstantReader annotation, BuildStep buildStep) {
if (!(element is ClassElement)) {
throw Exception("Selectors should be applied on class only");
}
final className = element.name;
if (!className.startsWith("_")) {
throw Exception("Selectors functions class should start with _");
}
final modelName = className.substring(1);
final visitor = SelectorsVisitor(modelName);
final astNode = getAstNodeFromElement(element);
astNode.visitChildren(visitor);
return """
// Selector
""";
}
}
class SelectorsVisitor extends SimpleAstVisitor {
final String modelName;
final selectors = <String>[];
SelectorsVisitor(this.modelName);
#override
dynamic visitMethodDeclaration(MethodDeclaration node) {
final fields = convertParamsToFields(node.parameters);
if (fields.isEmpty || fields.length > 1) {
throw Exception(
"Selector functions should be only one param with app state");
}
final field = fields.first;
var name = node.name.toString();
if (node.returnType == null) {
throw Exception("You sould annontate return type of method ${name} ");
}
final rType = node.returnType.toString();
final sType = field.type;
final bvs = SelectorBodyVisitor(field.param!.identifier);
node.body.visitChildren(bvs);
// node.body.visitChildren(visitor)
return super.visitMethodDeclaration(node);
}
}
class SelectorBodyVisitor extends RecursiveAstVisitor {
final Identifier identifier;
final List<List<String>> depsList = [];
SelectorBodyVisitor(this.identifier);
List<String> getListOfPropAccess(PropertyAccess node) {
final result = <String>[];
final prop = node.propertyName.toString();
result.add(prop);
final target = node.target;
print("target type ${target.runtimeType}");
if (target is PropertyAccess) {
result.addAll(getListOfPropAccess(target));
} else if (target is PrefixedIdentifier) {
if (target.prefix.toString() == identifier.toString()) {
// I am trying to get identifier type here
print("IdentifierElement2 ${target.identifier.staticType}");
result.add(target.identifier.toString());
} else {
print("target is not identifier ${target.runtimeType} ${target}");
}
}
return result;
}
#override
dynamic visitPropertyAccess(PropertyAccess node) {
print("***&&& propsAccess ${node}");
final list = getListOfPropAccess(node);
final sa = node.toString().split(".").toList();
if (sa.length - 1 == list.length) {
// property access of state identifier
depsList.add(list.reversed.toList().take(2).toList());
}
print("Property access list ++++=== ++++++ ${list}");
}
#override
dynamic visitPrefixedIdentifier(PrefixedIdentifier node) {
print(
"**##### IdenAccess ${node} id: ${node.identifier} prefix : ${node.prefix} mid :${identifier.toString()}");
if (node.prefix.toString() == identifier.toString()) {
print("IdentifierElement1 ${node.identifier.staticType}");
depsList.add([node.identifier.toString()]);
} else {
print("identifier is not equal ${node.prefix == identifier}");
}
}
}
Example
class User {
final String name;
User(this.name)
}
class Model {
final User user;
Model(this.user)
}
#Selectors()
abstract class MySelectors {
static s1(Model model) {
final n = model.user.name; // i want to know type of name in code generation time , please check this line print("IdentifierElement2 ${target.identifier.staticType}"); in above code , where i am getting null
}
}
Found answer , I have to use getResolvedLibraryByElement instead of getParsedLibraryByElement in getAstNodeFromElement method.
Future<AstNode> getAstNodeFromElement(Element element) async {
AnalysisSession session = element.session;
final s = await session.getResolvedLibraryByElement(element.library);
final s2 = s.getElementDeclaration(element);
return s2.node;
}
Related
I am trying to develop custom source for parallel GCS content scanning. The naive approach would be to loop through listObjects function calls:
while (...) {
Objects objects = gcsUtil.listObjects(bucket, prefix, pageToken);
pageToken = objects.getNextPageToken();
...
}
The problem is performance for the tens of millions objects.
Instead of the single thread code we can add delimiter / and submit parallel processed for each prefix found:
...
Objects objects = gcsUtil.listObjects(bucket, prefix, pageToken, "/");
for (String subPrefix : object.getPrefixes()) {
scanAsync(bucket, subPrefix);
}
...
Next idea was to try to wrap this logic in Splittable DoFn.
Choice of RestrictionTracker: I don't see how can be used any of exiting RestrictionTracker. So decided to write own. Restriction itself is basically list of prefixes to scan. tryClaim checks if there is more prefixes left and receive newly scanned to append them to current restriction. trySplit splits list of prefixes.
The problem that I faced that trySplit can be called before all subPrefixes are found. In this case current restriction may receive more work to do after it was splitted. And it seems that trySplit is being called until it returns a not null value for a given RestrictionTracker: after certain number of elements goes to the output or after 1 second via scheduler or when ProcessContext.resume() returned. This doesn't work in my case as new prefixes can be found at any time. And I can't checkpoint via return ProcessContext.resume() because if split was already done, possible work that left in current restriction will cause checkDone() function to fail.
Another problem that I suspect that I couldn't achieve parallel execution in DirectRunner. As trySplit was always called with fractionOfRemainder=0 and new RestrictionTracker was started only after current one completed its piece of work.
It would be also great to read more detailed explanation about Splittable DoFn components lifecycle. How parallel execution per element is achieved. And how and when state of RestrictionTracker can be modified.
UPD: Adding simplified code that should show intended implementation
#DoFn.BoundedPerElement
private static class ScannerDoFn extends DoFn<String, String> {
private transient GcsUtil gcsUtil;
#GetInitialRestriction
public ScannerRestriction getInitialRestriction(#Element String bucket) {
return ScannerRestriction.init(bucket);
}
#ProcessElement
public ProcessContinuation processElement(
ProcessContext c,
#Element String bucket,
RestrictionTracker<ScannerRestriction, ScannerPosition> tracker,
OutputReceiver<String> outputReceiver) {
if (gcsUtil == null) {
gcsUtil = c.getPipelineOptions().as(GcsOptions.class).getGcsUtil();
}
ScannerRestriction currentRestriction = tracker.currentRestriction();
ScannerPosition position = new ScannerPosition();
while (true) {
if (tracker.tryClaim(position)) {
if (position.completedCurrent) {
// position.clear();
// ideally I would to get checkpoint here before starting new work
return ProcessContinuation.resume();
}
try {
Objects objects = gcsUtil.listObjects(
currentRestriction.bucket,
position.currentPrefix,
position.currentPageToken,
"/");
if (objects.getItems() != null) {
for (StorageObject o : objects.getItems()) {
outputReceiver.output(o.getName());
}
}
if (objects.getPrefixes() != null) {
position.newPrefixes.addAll(objects.getPrefixes());
}
position.currentPageToken = objects.getNextPageToken();
if (position.currentPageToken == null) {
position.completedCurrent = true;
}
} catch (Throwable throwable) {
logger.error("Error during scan", throwable);
}
} else {
return ProcessContinuation.stop();
}
}
}
#NewTracker
public RestrictionTracker<ScannerRestriction, ScannerPosition> restrictionTracker(#Restriction ScannerRestriction restriction) {
return new ScannerRestrictionTracker(restriction);
}
#GetRestrictionCoder
public Coder<ScannerRestriction> getRestrictionCoder() {
return ScannerRestriction.getCoder();
}
}
public static class ScannerPosition {
private String currentPrefix;
private String currentPageToken;
private final List<String> newPrefixes;
private boolean completedCurrent;
public ScannerPosition() {
this.currentPrefix = null;
this.currentPageToken = null;
this.newPrefixes = Lists.newArrayList();
this.completedCurrent = false;
}
public void clear() {
this.currentPageToken = null;
this.currentPrefix = null;
this.completedCurrent = false;
}
}
private static class ScannerRestriction {
private final String bucket;
private final LinkedList<String> prefixes;
private ScannerRestriction(String bucket) {
this.bucket = bucket;
this.prefixes = Lists.newLinkedList();
}
public static ScannerRestriction init(String bucket) {
ScannerRestriction res = new ScannerRestriction(bucket);
res.prefixes.add("");
return res;
}
public ScannerRestriction empty() {
return new ScannerRestriction(bucket);
}
public boolean isEmpty() {
return prefixes.isEmpty();
}
public static Coder<ScannerRestriction> getCoder() {
return ScannerRestrictionCoder.INSTANCE;
}
private static class ScannerRestrictionCoder extends AtomicCoder<ScannerRestriction> {
private static final ScannerRestrictionCoder INSTANCE = new ScannerRestrictionCoder();
private final static Coder<List<String>> listCoder = ListCoder.of(StringUtf8Coder.of());
#Override
public void encode(ScannerRestriction value, OutputStream outStream) throws IOException {
NullableCoder.of(StringUtf8Coder.of()).encode(value.bucket, outStream);
listCoder.encode(value.prefixes, outStream);
}
#Override
public ScannerRestriction decode(InputStream inStream) throws IOException {
String bucket = NullableCoder.of(StringUtf8Coder.of()).decode(inStream);
List<String> prefixes = listCoder.decode(inStream);
ScannerRestriction res = new ScannerRestriction(bucket);
res.prefixes.addAll(prefixes);
return res;
}
}
}
private static class ScannerRestrictionTracker extends RestrictionTracker<ScannerRestriction, ScannerPosition> {
private ScannerRestriction restriction;
private ScannerPosition lastPosition = null;
ScannerRestrictionTracker(ScannerRestriction restriction) {
this.restriction = restriction;
}
#Override
public boolean tryClaim(ScannerPosition position) {
restriction.prefixes.addAll(position.newPrefixes);
position.newPrefixes.clear();
if (position.completedCurrent) {
// completed work for current prefix
assert lastPosition != null && lastPosition.currentPrefix.equals(position.currentPrefix);
lastPosition = null;
return true; // return true but we would need to claim again if we need to get next prefix
} else if (lastPosition != null && lastPosition.currentPrefix.equals(position.currentPrefix)) {
// proceed work for current prefix
lastPosition = position;
return true;
}
// looking for next prefix
assert position.currentPrefix == null;
assert lastPosition == null;
if (restriction.isEmpty()) {
// no work to do
return false;
}
position.currentPrefix = restriction.prefixes.poll();
lastPosition = position;
return true;
}
#Override
public ScannerRestriction currentRestriction() {
return restriction;
}
#Override
public SplitResult<ScannerRestriction> trySplit(double fractionOfRemainder) {
if (lastPosition == null && restriction.isEmpty()) {
// no work at all
return null;
}
if (lastPosition != null && restriction.isEmpty()) {
// work at the moment only at currently scanned prefix
return SplitResult.of(restriction, restriction.empty());
}
int size = restriction.prefixes.size();
int newSize = new Double(Math.round(fractionOfRemainder * size)).intValue();
if (newSize == 0) {
ScannerRestriction residual = restriction;
restriction = restriction.empty();
return SplitResult.of(restriction, residual);
}
ScannerRestriction residual = restriction.empty();
for (int i=newSize; i<=size; i++) {
residual.prefixes.add(restriction.prefixes.removeLast());
}
return SplitResult.of(restriction, residual);
}
#Override
public void checkDone() throws IllegalStateException {
if (lastPosition != null) {
throw new IllegalStateException("Called checkDone on not completed job");
}
}
#Override
public IsBounded isBounded() {
return IsBounded.UNBOUNDED;
}
}
I want to get TypeAnnotation source to get annotations defined on that type
// file1.dart
#Annoation(name :"hello")
class RType { }
// file2.dart
#Selectors()
class Example {
static Rtype hello() => null;
}
by using ast visitor i am able to get RType ( TypeAnnoation) , but i want to get actual RType and its annotations ..
class SelectorsGenerator extends GeneratorForAnnotation<Selectors> {
AstNode getAstNodeFromElement(Element element) {
AnalysisSession session = element.session;
ParsedLibraryResult parsedLibResult =
session.getParsedLibraryByElement(element.library);
ElementDeclarationResult elDeclarationResult =
parsedLibResult.getElementDeclaration(element);
return elDeclarationResult.node;
}
#override
generateForAnnotatedElement(
Element element, ConstantReader annotation, BuildStep buildStep) {
if (!(element is ClassElement)) {
throw Exception("Selectors should be applied on class only");
}
element = element as ClassElement;
final visitor = ExampleVisitor();
final astNode = getAstNodeFromElement(element);
astNode.visitChildren(visitor);
return """
// Selector
""";
}
}
class ExampleVisitor extends SimpleAstVisitor {
#override
visitMethodDeclaration(MethodDeclaration node) {
final t= node.returnType; //TypeAnnonation
t.type // DartType is null here :(
//TODO i want to get annotations defined on this type
}
}
You shouldn't need to switch to the AST model for this, it should be possible to get the annotation with the Element model.
var methods = classElement.methods;
for (var method in methods) {
var returnType = method.returnType;
var metadata = returnType.element.metadata;
// Do something with the annotation.
}
Our program displays a tree control showing the metadata structure of the XML file they are using as a datasource. So it displays all elements & attributes in use in the XML file, like this:
Employees
Employee
FirstName
LastName
Orders
Order
OrderId
For the case where the user does not pass us a XSD file, we need to walk the XML file and build up the metadata structure.
The full code for this is at SaxonQuestions.zip, TestBuildTree.java and is also listed below.
I am concerned that my code is not the most efficient, or maybe even wrong. It works, but it works on the 3 XML files I tested it on. My questions are:
What is the best way to get the root element from the DOM? Is it walking the children of the DOM root node?
What is the best way to determine if an element has data (as opposed to just child elements)? The best I could come up with throws an exception if not and I don't think code executing the happy path should throw an exception.
What is the best way to get the class of the data held in an element or attribute? Is it: ((XdmAtomicValue)((XdmNode)currentNode).getTypedValue()).getValue().getClass();
Is the best way to walk all the nodes to use XdmNode.axisIterator? And to do so as I have in this code?
TestBuildTree.java
import net.sf.saxon.s9api.*;
import java.io.File;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;
public class TestBuildTree {
public static void main(String[] args) throws Exception {
XmlDatasource datasource = new XmlDatasource(
new FileInputStream(new File("files", "SouthWind.xml").getCanonicalPath()),
null);
// Question:
// Is this the best way to get the root element?
// get the root element
XdmNode rootNode = null;
for (XdmNode node : datasource.getXmlRootNode().children()) {
if (node.getNodeKind() == XdmNodeKind.ELEMENT) {
rootNode = node;
break;
}
}
TestBuildTree buildTree = new TestBuildTree(rootNode);
Element root = buildTree.addNode();
System.out.println("Schema:");
printElement("", root);
}
private static void printElement(String indent, Element element) {
System.out.println(indent + "<" + element.name + "> (" + (element.type == null ? "null" : element.type.getSimpleName()) + ")");
indent += " ";
for (Attribute attr : element.attributes)
System.out.println(indent + "=" + attr.name + " (" + (attr.type == null ? "null" : attr.type.getSimpleName()) + ")");
for (Element child : element.children)
printElement(indent, child);
}
protected XdmItem currentNode;
public TestBuildTree(XdmItem currentNode) {
this.currentNode = currentNode;
}
private Element addNode() throws SaxonApiException {
String name = ((XdmNode)currentNode).getNodeName().getLocalName();
// Question:
// Is this the best way to determine that this element has data (as opposed to child elements)?
Boolean elementHasData;
try {
((XdmNode) currentNode).getTypedValue();
elementHasData = true;
} catch (Exception ex) {
elementHasData = false;
}
// Questions:
// Is this the best way to get the type of the element value?
// If no schema is it always String?
Class valueClass = ! elementHasData ? null : ((XdmAtomicValue)((XdmNode)currentNode).getTypedValue()).getValue().getClass();
Element element = new Element(name, valueClass, null);
// add in attributes
XdmSequenceIterator currentSequence;
if ((currentSequence = moveTo(Axis.ATTRIBUTE)) != null) {
do {
name = ((XdmNode) currentNode).getNodeName().getLocalName();
// Questions:
// Is this the best way to get the type of the attribute value?
// If no schema is it always String?
valueClass = ((XdmAtomicValue)((XdmNode)currentNode).getTypedValue()).getValue().getClass();
Attribute attr = new Attribute(name, valueClass, null);
element.attributes.add(attr);
} while (moveToNextInCurrentSequence(currentSequence));
moveTo(Axis.PARENT);
}
// add in children elements
if ((currentSequence = moveTo(Axis.CHILD)) != null) {
do {
Element child = addNode();
// if we don't have this, add it
Element existing = element.getChildByName(child.name);
if (existing == null)
element.children.add(child);
else
// add in any children this does not have
existing.addNewItems (child);
} while (moveToNextInCurrentSequence(currentSequence));
moveTo(Axis.PARENT);
}
return element;
}
// moves to element or attribute
private XdmSequenceIterator moveTo(Axis axis) {
XdmSequenceIterator en = ((XdmNode) currentNode).axisIterator(axis);
boolean gotIt = false;
while (en.hasNext()) {
currentNode = en.next();
if (((XdmNode) currentNode).getNodeKind() == XdmNodeKind.ELEMENT || ((XdmNode) currentNode).getNodeKind() == XdmNodeKind.ATTRIBUTE) {
gotIt = true;
break;
}
}
if (gotIt) {
if (axis == Axis.ATTRIBUTE || axis == Axis.CHILD || axis == Axis.NAMESPACE)
return en;
return null;
}
return null;
}
// moves to next element or attribute
private Boolean moveToNextInCurrentSequence(XdmSequenceIterator currentSequence)
{
if (currentSequence == null)
return false;
while (currentSequence.hasNext())
{
currentNode = currentSequence.next();
if (((XdmNode)currentNode).getNodeKind() == XdmNodeKind.ELEMENT || ((XdmNode)currentNode).getNodeKind() == XdmNodeKind.ATTRIBUTE)
return true;
}
return false;
}
static class Node {
String name;
Class type;
String description;
public Node(String name, Class type, String description) {
this.name = name;
this.type = type;
this.description = description;
}
}
static class Element extends Node {
List<Element> children;
List<Attribute> attributes;
public Element(String name, Class type, String description) {
super(name, type, description);
children = new ArrayList<>();
attributes = new ArrayList<>();
}
public Element getChildByName(String name) {
for (Element child : children) {
if (child.name.equals(name))
return child;
}
return null;
}
public void addNewItems(Element child) {
for (Attribute attrAdd : child.attributes) {
boolean haveIt = false;
for (Attribute attrExist : attributes)
if (attrExist.name.equals(attrAdd.name)) {
haveIt = true;
break;
}
if (!haveIt)
attributes.add(attrAdd);
}
for (Element elemAdd : child.children) {
Element exist = null;
for (Element elemExist : children)
if (elemExist.name.equals(elemAdd.name)) {
exist = elemExist;
break;
}
if (exist == null)
children.add(elemAdd);
else
exist.addNewItems(elemAdd);
}
}
}
static class Attribute extends Node {
public Attribute(String name, Class type, String description) {
super(name, type, description);
}
}
}
XmlDatasource.java
import com.saxonica.config.EnterpriseConfiguration;
import com.saxonica.ee.s9api.SchemaValidatorImpl;
import net.sf.saxon.Configuration;
import net.sf.saxon.lib.FeatureKeys;
import net.sf.saxon.s9api.*;
import net.sf.saxon.type.SchemaException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
import javax.xml.transform.Source;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
public class XmlDatasource {
/** the DOM all searches are against */
private XdmNode xmlRootNode;
private XPathCompiler xPathCompiler;
/** key == the prefix; value == the uri mapped to that prefix */
private HashMap<String, String> prefixToUriMap = new HashMap<>();
/** key == the uri mapped to that prefix; value == the prefix */
private HashMap<String, String> uriToPrefixMap = new HashMap<>();
public XmlDatasource (InputStream xmlData, InputStream schemaFile) throws SAXException, SchemaException, SaxonApiException, IOException {
boolean haveSchema = schemaFile != null;
// call this before any instantiation of Saxon classes.
Configuration config = createEnterpriseConfiguration();
if (haveSchema) {
Source schemaSource = new StreamSource(schemaFile);
config.addSchemaSource(schemaSource);
}
Processor processor = new Processor(config);
DocumentBuilder doc_builder = processor.newDocumentBuilder();
XMLReader reader = createXMLReader();
InputSource xmlSource = new InputSource(xmlData);
SAXSource saxSource = new SAXSource(reader, xmlSource);
if (haveSchema) {
SchemaValidator validator = new SchemaValidatorImpl(processor);
doc_builder.setSchemaValidator(validator);
}
xmlRootNode = doc_builder.build(saxSource);
xPathCompiler = processor.newXPathCompiler();
if (haveSchema)
xPathCompiler.setSchemaAware(true);
declareNameSpaces();
}
public XdmNode getXmlRootNode() {
return xmlRootNode;
}
public XPathCompiler getxPathCompiler() {
return xPathCompiler;
}
/**
* Create a XMLReader set to disallow XXE aattacks.
* #return a safe XMLReader.
*/
public static XMLReader createXMLReader() throws SAXException {
XMLReader reader = XMLReaderFactory.createXMLReader();
// stop XXE https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Prevention_Cheat_Sheet#JAXP_DocumentBuilderFactory.2C_SAXParserFactory_and_DOM4J
reader.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
return reader;
}
private void declareNameSpaces() throws SaxonApiException {
// saxon has some of their functions set up with this.
prefixToUriMap.put("saxon", "http://saxon.sf.net");
uriToPrefixMap.put("http://saxon.sf.net", "saxon");
XdmValue list = xPathCompiler.evaluate("//namespace::*", xmlRootNode);
if (list == null || list.size() == 0)
return;
for (int index=0; index<list.size(); index++) {
XdmNode node = (XdmNode) list.itemAt(index);
String prefix = node.getNodeName() == null ? "" : node.getNodeName().getLocalName();
// xml, xsd, & xsi are XML structure ones, not ones used in the XML
if (prefix.equals("xml") || prefix.equals("xsd") || prefix.equals("xsi"))
continue;
// use default prefix if prefix is empty.
if (prefix == null || prefix.isEmpty())
prefix = "def";
// this returns repeats, so if a repeat, go on to next.
if (prefixToUriMap.containsKey(prefix))
continue;
String uri = node.getStringValue();
if (uri != null && !uri.isEmpty()) {
xPathCompiler.declareNamespace(prefix, uri);
prefixToUriMap.put(prefix, uri);
uriToPrefixMap.put(uri, prefix); }
}
}
public static EnterpriseConfiguration createEnterpriseConfiguration()
{
EnterpriseConfiguration configuration = new EnterpriseConfiguration();
configuration.supplyLicenseKey(new BufferedReader(new java.io.StringReader(deobfuscate(key))));
configuration.setConfigurationProperty(FeatureKeys.SUPPRESS_XPATH_WARNINGS, Boolean.TRUE);
return configuration;
}
}
I try to customize HyperlinkHelper. So I have override HypertextDetector
package org.xtext.example.mydsl.ui;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.hyperlink.IHyperlink;
import org.eclipse.xtext.ui.editor.hyperlinking.DefaultHyperlinkDetector;
import org.eclipse.xtext.ui.editor.hyperlinking.IHyperlinkHelper;
public class MyHyperlinkDetector extends DefaultHyperlinkDetector {
private static final String PREFERENCES = ".hyper";
#Override
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
IDocument document = textViewer.getDocument();
int offset = region.getOffset();
// extract relevant characters
IRegion lineRegion;
String candidate;
try {
lineRegion = document.getLineInformationOfOffset(offset);
candidate = document.get(lineRegion.getOffset(), lineRegion.getLength());
} catch (BadLocationException ex) {
return null;
}
// look for keyword
int index = candidate.indexOf(PREFERENCES);
if (index != -1) {
// detect region containing keyword
IRegion targetRegion = new Region(lineRegion.getOffset() + index, PREFERENCES.length());
if ((targetRegion.getOffset() <= offset)
&& ((targetRegion.getOffset() + targetRegion.getLength()) > offset))
// create link
return new IHyperlink[] { new PreferencesHyperlink(targetRegion, candidate) };
}
return null;
}
#Override
public IHyperlinkHelper getHelper() {
// TODO Auto-generated method stub
return new MyHyperlinkHelper();
}
}
Hyperlink detector is worked, but MyHyperlinkHelper is never created. Even if I comment method detectHyperlinks.
My goal is to open file with name what I have click in my edited dsl grammar. That's why I need HyperlinkHelper. I.e. I need to check does my substring is correct file name.
How to solve it?
Regards,
Vladimir.
dont override the method. simply use guice and call the method from the superclass in your impl
public Class<? extends IHyperlinkHelper> bindIHyperlinkHelper() {
return DomainmodelHyperlinkHelper.class;
}
or in Xtend
def Class<? extends IHyperlinkHelper> bindIHyperlinkHelper() {
return DomainmodelHyperlinkHelper;
}
I have this annotation
class Target{
final String value;
const Target(this.value);
}
and 2 classes that are annotated with it
#Target("/313")
class c1{
}
#Target("/314")
class c2{
}
how can i get a List of ClassMirror instances for the classes that have the Target annotation?
based on the selected answer that is if i knew what library my calsses exist in
var mirrorSystem = currentMirrorSystem();
var libraryMirror = mirrorSystem.findLibrary(#testlib);
for(ClassMirror classMirror in libraryMirror.declarations.values){
if(classMirror.metadata!=null){
for(var meta in classMirror.metadata){
if(meta.type == reflectClass(Path)){
print(classMirror.simpleName);
print(meta.getField(#value));
}
}
}
}
This searches all libraries in the current isolate for classes that are annotated with #Target('/313')
#MirrorsUsed(metaTargets: Target) // might be necessary when you build this code to JavaScript
import 'dart:mirrors';
class Target {
final String id;
const Target(this.id);
}
#Target('/313')
class c1{
}
#Target('/314')
class c2{
}
#Target('/313')
#Target('/314')
class c3{
}
void main() {
MirrorSystem mirrorSystem = currentMirrorSystem();
mirrorSystem.libraries.forEach((lk, l) {
l.declarations.forEach((dk, d) {
if(d is ClassMirror) {
ClassMirror cm = d as ClassMirror;
cm.metadata.forEach((md) {
InstanceMirror metadata = md as InstanceMirror;
if(metadata.type == reflectClass(Target) && metadata.getField(#id).reflectee == '/313') {
print('found: ${cm.simpleName}');
}
});
}
});
});
}
found: Symbol("c3")
found: Symbol("c1")